We investigated the thermal decomposition of exo-tetrahydrodicyclopentadiene (exo-THDCP, C10H16) in the absence and presence of various metals, Ti, SS316, SS304, Fe, Ni, and Cu. It was found that conversion of exo-THDCP was faster in the presence of metals as compared to in their absence. The order of the metal effects on the increase in the conversion of exo-THDCP was Ti < SS316 < SS304 < Fe < Ni < Cu. The metal-induced increase in the conversion of exo-THDCP was higher at the higher temperature. In addition, the metal-induced increases in the rates of C5-9, C15-, and C-sd product formations were higher than those of <= C-4 and C10-14. The composition and crystallinity of metal surfaces were found to be associated with the distinct metal effects on the thermal decomposition of exo-THDCP.